Thats an idea , I have been toying with for a while, up here in jordy land !
Due to the 'Credit Crunch' hitting my existing business really hard, and the injury to my back, I am looking for something to do that I will enjoy and could earn some dollar..., I have most of the tools required, have a vehicle to pick up and do on site repairs, not sure about things like pricing and also obtaining stock at trade prices ? and also how viable it would be long term, especially with people cutting right back on non essentials, there are a lot of cyclist up here and no local shops of any worth .. I think you need to assess the potential market in your area and maybe do some sort of survey..